Thank you for your help

The answer is A.(-4,3)

Step-by-step explanation:

Multiply the first equation by -3,and multiply the second equation by 1.

−3(x+y=−1)

1(3x−4y=−24)

Becomes:

−3x−3y=3

3x−4y=−24

Add these equations to eliminate x:

−7y=−21

Then solve−7y=−21for y:

−7y=−21

y=3

Now that we've found y let's plug it back in to solve for x.

Heres our original equation

x+y=−1

Substitute 3 for y in x+y=−1:

x+3=−1

x+3+−3=−1+−3(Add -3 to both sides)

x=-4